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index.js
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index.js
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import { writeFileSync, existsSync } from 'fs';
import { join, posix } from 'path';
import { fileURLToPath } from 'url';
import esbuild from 'esbuild';
/**
* @typedef {import('esbuild').BuildOptions} BuildOptions
*/
const ssrFunctionRoute = '/api/__render';
/**
* Validate the static web app configuration does not override the minimum config for the adapter to work correctly.
* @param config {import('./types/swa').CustomStaticWebAppConfig}
* */
function validateCustomConfig(config) {
if (config) {
if ('navigationFallback' in config) {
throw new Error('customStaticWebAppConfig cannot override navigationFallback.');
}
if (config.routes && config.routes.find((route) => route.route === '*')) {
throw new Error(`customStaticWebAppConfig cannot override '*' route.`);
}
}
}
/** @type {import('.').default} */
export default function ({
debug = false,
customStaticWebAppConfig = {},
esbuildOptions = {}
} = {}) {
return {
name: 'adapter-azure-swa',
async adapt(builder) {
if (!existsSync(join('api', 'package.json'))) {
throw new Error(
'You need to create a package.json in your `api` directory. See the adapter README for details.'
);
}
const swaConfig = generateConfig(customStaticWebAppConfig, builder.config.kit.appDir);
const tmp = builder.getBuildDirectory('azure-tmp');
const publish = 'build';
const staticDir = join(publish, 'static');
const apiDir = join('api', 'render');
const entry = `${tmp}/entry.js`;
builder.log.minor(`Publishing to "${publish}"`);
builder.rimraf(tmp);
builder.rimraf(publish);
builder.rimraf(apiDir);
const files = fileURLToPath(new URL('./files', import.meta.url));
builder.log.minor('Generating serverless function...');
// use posix because of https://github.com/sveltejs/kit/pull/3200
const relativePath = posix.relative(tmp, builder.getServerDirectory());
builder.copy(join(files, 'entry.js'), entry, {
replace: {
SERVER: `${relativePath}/index.js`,
MANIFEST: './manifest.js',
DEBUG: debug.toString()
}
});
writeFileSync(
`${tmp}/manifest.js`,
`export const manifest = ${builder.generateManifest({
relativePath
})};\n`
);
builder.copy(join(files, 'api'), apiDir);
/** @type {BuildOptions} */
const default_options = {
entryPoints: [entry],
outfile: join(apiDir, 'index.js'),
bundle: true,
platform: 'node',
target: 'node16',
sourcemap: 'linked',
external: esbuildOptions.external
};
await esbuild.build(default_options);
builder.log.minor('Copying assets...');
builder.writeClient(staticDir);
builder.writePrerendered(staticDir);
if (!builder.prerendered.paths.includes('/')) {
// Azure SWA requires an index.html to be present
// If the root was not pre-rendered, add a placeholder index.html
// Route all requests for the index to the SSR function
writeFileSync(`${staticDir}/index.html`, '');
swaConfig.routes.push(
{
route: '/index.html',
rewrite: ssrFunctionRoute
},
{
route: '/',
rewrite: ssrFunctionRoute
}
);
}
writeFileSync(`${publish}/staticwebapp.config.json`, JSON.stringify(swaConfig));
}
};
}
/**
* @param {import('./types/swa').CustomStaticWebAppConfig} customStaticWebAppConfig
* @param {string} appDir
* @returns {import('./types/swa').StaticWebAppConfig}
*/
export function generateConfig(customStaticWebAppConfig, appDir) {
validateCustomConfig(customStaticWebAppConfig);
if (!customStaticWebAppConfig.routes) {
customStaticWebAppConfig.routes = [];
}
/** @type {import('./types/swa').StaticWebAppConfig} */
const swaConfig = {
...customStaticWebAppConfig,
routes: [
...customStaticWebAppConfig.routes,
{
route: '*',
methods: ['POST', 'PUT', 'DELETE'],
rewrite: ssrFunctionRoute
},
{
route: `/${appDir}/immutable/*`,
headers: {
'cache-control': 'public, immutable, max-age=31536000'
}
}
],
navigationFallback: {
rewrite: ssrFunctionRoute
},
platform: {
apiRuntime: 'node:16'
}
};
return swaConfig;
}